It means you need a separate bias generator anyway. Andy aka k 10 You need to know your recording head’s inductance, maximum recording current and maximum bias current to design the bias generator. It might be as simple as mixing those two signals using resistors.

I don’t know which peak-to-peak level, and I’m not datwsheet sure what frequency. You may have to use a transformer to couple the two signals together and datashret still may cause the regular amplifier some issues. This is a screenshot of the datasheetpage 4. OK, this is how far I’ve got: Any and all information described or contained herein are subject to change without notice due to. Specifications and information herein are subject to.

PDF LA4160 Datasheet ( Hoja de datos )

When designing equipment, refer to the “Delivery Specification” for the. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or.

I found some schematics for AC bias circuits, but they were all very different, and I’m not sure which one is suitable for tape recorders. It’s likely just a permanent magnet that saturates the magnetic tape in one direction. Consider this circuit of the LA The products mentioned herein shall not be.

Given the rest of the Datasheet, I might be able to locate the point where this oscillator has to go. If you should intend to use our products for applications outside the standard applications of our. Since the output stage is of push-pull type, no remarkable drop in the output voltage occurs even at. AC bias circuit for a tape recorder Ask Question.

It looks like the circuit in page 3 will not be able to record anything in acceptable quality, but it can be a mistake in the datasheet itself. VG pre 20 log Z1 dB.

It’s a bit like when someone asks if you can fix their TV – I always reply “get me the circuit diagrams and I’ll have a look sometime “. This catalog provides information as of August, On page 3 of the datasheet, the bias oscillator is missing, is that DC biased then there’s just a filter with unmarked cap and resistor? It might be no more difficult than making a 70kHz signal and adding it to your “normal” record signal that feeds the tape head.

I’d like the most simple solution, which could be easily put on a daughter board and hidden in the tape recorder. Check the type of your recorder erasing head. It seems to be quite difficult the way you describe it.

Information including circuit diagrams and dataeheet parameters herein is for example only; it is not guaranteed for volume production. I was thinking maybe there’s an IC for that available, but again, I’m not sure on that one.

A single package contaning preamplifier, ALC circuit, power amplifier. Email Required, but never shown. I’ve done a little more research and I’ve added to my original post. I think somewhere around kHz makes the most sense.

LA Datasheet(PDF) – Sanyo Semicon Device

Shouldn’t the chip provide the bias current, etc? Since the output stage is of push-pull type, no remarkable drop in the output voltage occurs even at low load impedances and the output can be connected direct to the ALC circuit and meter circuit. Sign up using Email and Password.

Upon using the technical information or products described herein, neither warranty nor license shall be granted. To verify symptoms and states that cannot be evaluated in an independent device, the customer should always evaluate and test devices mounted in the customer ‘ s products or equipment.